Fig. 5
The Scargle periodogram of the O–C values of the primary (upper panel) and secondary component (lower panel) of KIC 4931738. The significance levels corresponding to a signal-to-noise ratio (calculated in a 3 d-1 window) of 4, 3.6, and 3 are plotted with red solid, dashed, and dot-dashed lines, respectively. The peak at 1.1040 ± 0.0006 d-1 is marked with a black triangle.
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